Key benefits Thorough exterior cleaning of Fluoride Filter Elements: wash with water and mild dishwashing soap, then rinse, using the blue caps to protect each end during cleaning. Removal of blue caps from both ends of both filter Elements is straightforward with clean hands. Reliable flushing and priming: turn the fluoride filter over and prime the opposite end to reverse the flow of water; repeat until water runs clear from both directions. Secure, sealable priming setup: the tan colored rubber priming button engages one end of a fluoride filter and aligns with the filter hole and the rubber washer hole to form a tight seal against the faucet. Applying pressure with your thumb helps create a better seal. Controlled flush for performance: while holding the priming button against the faucet, slowly turn on cold water to fill the filter cavity and flush water from the opposite end until clear. Clear and practical workflow: designed for easy, repeatable cleaning and priming without tools, with components that are easy to handle and reinstall. What is included and how it works Fluoride Filter Elements with blue caps on each end for protection during cleaning. Tan rubber priming button that seals against a faucet and aligns with the rubber washer to enable effective priming. Process enables flushing from both ends to ensure debris is removed and water runs clear. How to use 1) Clean and prep With the blue caps in place, wash the exterior of each Fluoride Filter Element using water and mild dishwashing soap; then rinse. With clean hands, remove both blue caps from each end of both filter Elements. 2) Prime by reversing flow Turn the Fluoride filter over and prime the opposite end (reverse the flow of water). Repeat the priming steps until water runs clear from both directions. 3) Attach priming button and seal Place the tan rubber priming button onto one end of a fluoride filter and align the hole of the filter with the hole of the rubber washer. Position the priming button against the sink faucet so that it creates a seal between the faucet and the Fluoride Filter. Place your thumb on of the faucet to apply pressure and improve the seal. 4) Flush and finish While holding the priming button against the faucet, slowly turn on the cold water. Allow water to fill the cavity of the filter and to flow from the opposite end. Continue until the water runs clear.